Astrophysical S factors of reactions with light nuclei

摘要

The two-cluster model is a phenomenological semi-microscopic approach to the study of multinucleon nuclear systems. In the framework of this model, interaction of nucleon clusters is described by the local two-body potential determined from the condition of description of data on cluster scattering and properties of their bound states. In this case the many-body character of the problem is taken into account approximately in terms of Pauli-allowed and Pauli-forbidden states of the total nucleon system. Accounting for the dependence of cluster interaction potential on orbital Young schemes characterizing the properties of permutation symmetry in the nucleon system is an important ingredient of the model. This approach is used for examination of photonuclear processes for p~2H, p~3H, p~6Li, p~(12)C and ~4He~(12)C, ~3He~4He, ~3H~4He, ~2H~4He systems and corresponding astrophysical S factors. It is demonstrated that this approach provides fairly good description of the data available in the low-energy region, especially for systems with the number of nucleons A > 4 when errors for the phase shifts of cluster scattering extracted from experimental data are minimal.